Whedon had previously alluded to a brother/sister duo being in the film, which EW later said was indeed Quicksilver and Scarlet Witch. When I brought up Quicksilver and the Scarlet Witch to Whedon, he confirmed they were the characters in question, explaining, “You know, they had a rough beginning. They’re interesting to me because they sort of represent the part of the world that wouldn’t necessarily agree with The Avengers. So they’re not there to make things easier. I’m not putting any characters in the movie that will make things easier.”